Vacuum Chamber Landed

12 03 2009

Received the vacuum chamber today. First of all, it’s huge. Way bigger than I imagined. I could easily fit inside it!

 

img_3294

When we took off one of the top ports we found this:

img_3305

After some further poking around, we realized what this chamber was originally for: depositing metal on Compact Disks! The CDs would go on those spindles, and everything spins around. 

So we need to take the top off to get into a position where we can remove all these guts. Fortunately, we have  a 1 ton crane laying around!

 

img_3303

 

Stuart checks out the machinery:

img_3313

 

And now we have an empty chamber:img_3317

The walls of the chamber are actually pretty clean, they were largely protected from the deposition material by all the sheet-metal installed inside. However as you can see from the colors, there is deposition residue here and there. Also some flakey deposition scaling. So at the very least it will need a good cleaning.

The gaskets are rubber, so this chamber is not intended for ultra high vacuum:

rubber_gaskets

And most of the ports are secured with specialty screws, I think they need this wrench:

special_screws1





Chassis Iteration

10 03 2009

Did an iteration of the chassis incorporating the gyro-radii calculations tom provided. Also made the channel for the superconducting cable thicker so I have more room to maneuver the cable, and allow for a greater volume of LN2.

chassis1

Ok the minimum physcial coil spacing for a dodec (based on truncated icosahedron) has to be at least [(SQRT(3)*SQRT(2) )/4]*R, (about 0.61R) where R= coil radius + coil container thickness.

 

And new lids to match:
lid3

In case you were wondering, this is a chassis that would accomodate enough SC cable to match the B fields on WB6:

chassis2





Capacitor of Destiny

9 03 2009

Just won this capacitor.  It should be useful for creating the high positive potential of the chassis, at about the levels of the WB6.

This thing can definitely deliver a lethal shock. It comes with the terminals shorted so it doesn’t spontaneously charge.   





Vacuum Pumps

6 03 2009

Let’s explore the world of vacuum pumps! 

Starting with units.

The pascal (symbol: Pa) is the SI derived unit of pressure.

The torr (symbol: torr[1]) is a non-SI unit of pressure defined as 1/760 of an Atmosphere. 1 torr = 133,322 pascal.

1 mbar  = 0.1 kPa

psi  = 6.894757 kPa.

Cubic feet per minute (CFPM or CFM) is a non-SI unit of measurement of the flow of a gas or liquid that indicates how much volume in cubic feet pass by a stationary point in one minute. The lower the CFPM the better the suction. 1 cfm = 4.71945×10-4 m3 s-1

 

Our target vacuum quality is 10^-9 torr, or 1.33322368 × 10-7 pascals.

 

Lets look at the different types of pumps:

 

Now lets take a look at what’s available on ebay:

rotary vane pump here is the spec sheet. possible rough pump.

varian diffusion pump

turbomolecular pump

cryo-trap to prevent back flow from diffusion pump.

 

I think the idea setup would be chamber -> cryo-trap -> oil diffusion pump -> rough pump.





Cryopump

5 03 2009

Just won this cryopump auction





Rorschach

2 03 2009

chassis





New Arrivals

1 03 2009

Specs: OD 6+ @ 690-1300 nm, OD13 @808nm specifically. For when you have gratuitous amounts of energylaser_goggles








Follow

Get every new post delivered to your Inbox.

Join 440 other followers